Open the terminal, and check macOS updates with the following command:sudo /usr/sbin/softwareupdate -l
You may see the following information in the terminal:Software Update Tool
Finding available software
Software Update found the following new or updated software:
* Label: macOS Catalina 10.15.4 Update-
Title: macOS Catalina 10.15.4 Update, Version: , Size: 4937259K, Recommended: YES, Action: restart,